Theory Of Machine - Study Mode

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[#131] A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

(A) 2 mm

(B) 2.22 mm

(C) 2.50 mm

(D) 3.0 mm

Correct Answer

(B) 2.22 mm

[#132] The lead screw of a lathe with nut forms a

(A) Rolling pair

(B) Sliding pair

(C) Screw pair

(D) Turning pair

Correct Answer

(C) Screw pair

[#133] The C.G. of a link in any mechanism would experience

(A) No acceleration

(B) Linear acceleration

(C) Angular acceleration

(D) Both angular and linear accelerations

Correct Answer

(D) Both angular and linear accelerations

[#134] There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

(A) $$frac{1}{{24}}$$

(B) $$frac{1}{8}$$

(C) $$frac{4}{{15}}$$

(D) 12

Correct Answer

(A) $$frac{1}{{24}}$$

[#135] For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a

(A) 30° V-engine

(B) 60° V-engine

(C) 120° V-engine

(D) 150° V-engine

Correct Answer

(A) 30° V-engine

Explanation

Solution: